From 0509b270a358fa563946368418f8e832d9b63452 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Mon, 16 May 2022 12:27:29 +0200
Subject: scripts/spdxcheck: Put excluded files and directories into a separate
 file

The files and directories which are excluded from scanning are currently
hard coded in the script. That's not maintainable and not accessible for
external tools.

Move the files and directories which should be excluded into a file.  The
default file is scripts/spdxexclude. This can be overridden with the
'-e $FILE' command line option.

The file format and syntax is similar to the .gitignore file.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 scripts/spdxcheck.py | 70 +++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 64 insertions(+), 6 deletions(-)

(limited to 'scripts/spdxcheck.py')

diff --git a/scripts/spdxcheck.py b/scripts/spdxcheck.py
index b9e0f1725a0a..18cb9f5b3d3d 100755
--- a/scripts/spdxcheck.py
+++ b/scripts/spdxcheck.py
@@ -6,6 +6,7 @@ from argparse import ArgumentParser
 from ply import lex, yacc
 import locale
 import traceback
+import fnmatch
 import sys
 import git
 import re
@@ -106,6 +107,7 @@ class id_parser(object):
         self.parser = yacc.yacc(module = self, write_tables = False, debug = False)
         self.lines_checked = 0
         self.checked = 0
+        self.excluded = 0
         self.spdx_valid = 0
         self.spdx_errors = 0
         self.spdx_dirs = {}
@@ -254,17 +256,47 @@ class id_parser(object):
         di.update(fname, base, fail)
         self.spdx_dirs[base] = di
 
+class pattern(object):
+    def __init__(self, line):
+        self.pattern = line
+        self.match = self.match_file
+        if line == '.*':
+            self.match = self.match_dot
+        elif line.endswith('/'):
+            self.pattern = line[:-1]
+            self.match = self.match_dir
+        elif line.startswith('/'):
+            self.pattern = line[1:]
+            self.match = self.match_fn
+
+    def match_dot(self, fpath):
+        return os.path.basename(fpath).startswith('.')
+
+    def match_file(self, fpath):
+        return os.path.basename(fpath) == self.pattern
+
+    def match_fn(self, fpath):
+        return fnmatch.fnmatchcase(fpath, self.pattern)
+
+    def match_dir(self, fpath):
+        if self.match_fn(os.path.dirname(fpath)):
+            return True
+        return fpath.startswith(self.pattern)
+
+def exclude_file(fpath):
+    for rule in exclude_rules:
+        if rule.match(fpath):
+            return True
+    return False
+
 def scan_git_tree(tree, basedir, dirdepth):
     parser.set_dirinfo(basedir, dirdepth)
     for el in tree.traverse():
-        # Exclude stuff which would make pointless noise
-        # FIXME: Put this somewhere more sensible
-        if el.path.startswith("LICENSES"):
-            continue
-        if el.path.find("license-rules.rst") >= 0:
-            continue
         if not os.path.isfile(el.path):
             continue
+        if exclude_file(el.path):
+            parser.excluded += 1
+            continue
         with open(el.path, 'rb') as fd:
             parser.parse_lines(fd, args.maxlines, el.path)
 
@@ -273,6 +305,20 @@ def scan_git_subtree(tree, path, dirdepth):
         tree = tree[p]
     scan_git_tree(tree, path.strip('/'), dirdepth)
 
+def read_exclude_file(fname):
+    rules = []
+    if not fname:
+        return rules
+    with open(fname) as fd:
+        for line in fd:
+            line = line.strip()
+            if line.startswith('#'):
+                continue
+            if not len(line):
+                continue
+            rules.append(pattern(line))
+    return rules
+
 if __name__ == '__main__':
 
     ap = ArgumentParser(description='SPDX expression checker')
@@ -281,6 +327,8 @@ if __name__ == '__main__':
                     help='Show [sub]directory statistics.')
     ap.add_argument('-D', '--depth', type=int, default=-1,
                     help='Directory depth for -d statistics. Default: unlimited')
+    ap.add_argument('-e', '--exclude',
+                    help='File containing file patterns to exclude. Default: scripts/spdxexclude')
     ap.add_argument('-f', '--files', action='store_true',
                     help='Show files without SPDX.')
     ap.add_argument('-m', '--maxlines', type=int, default=15,
@@ -316,6 +364,15 @@ if __name__ == '__main__':
         sys.stderr.write('%s\n' %traceback.format_exc())
         sys.exit(1)
 
+    try:
+        fname = args.exclude
+        if not fname:
+            fname = os.path.join(os.path.dirname(__file__), 'spdxexclude')
+        exclude_rules = read_exclude_file(fname)
+    except Exception as ex:
+        sys.stderr.write('FAIL: Reading exclude file %s: %s\n' %(fname, ex))
+        sys.exit(1)
+
     try:
         if len(args.path) and args.path[0] == '-':
             stdin = os.fdopen(sys.stdin.fileno(), 'rb')
@@ -349,6 +406,7 @@ if __name__ == '__main__':
                 sys.stderr.write('License IDs        %12d\n' %len(spdx.licenses))
                 sys.stderr.write('Exception IDs      %12d\n' %len(spdx.exceptions))
                 sys.stderr.write('\n')
+                sys.stderr.write('Files excluded:    %12d\n' %parser.excluded)
                 sys.stderr.write('Files checked:     %12d\n' %parser.checked)
                 sys.stderr.write('Lines checked:     %12d\n' %parser.lines_checked)
                 if parser.checked:
-- 
cgit v1.2.3-70-g09d2